MOC3D
MOC3D: Free code for 3D solute transport in MODFLOW groundwater-flow models. Ranked #11 of 11 in Groundwater Modeling Software by our editors (6.9/10); pricing: Free plan; best for basic 3D solute transport with MODFLOW.
At a glance
- Editor score6.9 / 10
- PricingFree plan
- Best forBasic 3D solute transport with MODFLOW
- Free planYes
- Paid fromFree
- Flow modeling methodFinite-difference
- Facts checked24 Sep 2026
Where it wins
- Simulates three-dimensional groundwater solute transport.
- Models advection, dispersion, and chemical reactions.
- Works with MODFLOW flow models and is free.
Where it doesn't
- Focused on solute transport rather than general-purpose GIS.
- Requires a MODFLOW groundwater-flow model.
- Documentation is the only listed support channel.
Our verdict on MOC3D
MOC3D is a USGS numerical modeling code for groundwater modelers and researchers studying solute or contaminant movement through aquifers. It simulates three-dimensional transport in groundwater-flow systems and works with MODFLOW models. Its scope is specific: this is not a general-purpose GIS or standalone desktop application, but a transport model for analyses built around groundwater flow.
Its modeling focus is advection, dispersion, and chemical reactions that affect solute movement. That makes MOC3D a fit when the question is how dissolved material moves through an aquifer under a MODFLOW flow model, rather than a broad groundwater platform covering unrelated workflows. The published description identifies three-dimensional transport and finite-difference flow modeling; buyers should assess whether that method and focused transport scope suit their modeling needs.
MOC3D is free and open source, so there is no paid tier to compare. It is self-hosted, and documentation is the listed support channel. The product details do not specify platform or integration options beyond its relationship with MODFLOW, so it is best suited to teams already working in that modeling context and comfortable with a numerical code. Choose it for no-cost 3D transport analysis involving advection, dispersion, and reactions; look elsewhere if you need a standalone desktop application, general-purpose GIS, or a broader set of verified platform and support options.
Your product? Our editors can test MOC3D in depth and publish a review, labelled as paid · from $149/mo →
MOC3D pricing
MOC3D fact sheet
| Free plan | Yes |
|---|---|
| Paid from | Free |
| Flow modeling method | Finite-difference |
| Transport modeling | Yes |
| Surface-water coupling | Not verified |
| Model dimensions | 3d |
| GIS data exchange | Not verified |
| Supported platforms | Not verified |
| Deployment | Self-hosted |
| Support | Docs |
| Built for | Small business, Mid-market, Enterprise (editorial estimate) |
| Pricing | Free plan |
| Website | usgs.gov |
| Facts checked | 24 Sep 2026 |
Alternatives to MOC3D
- MODFLOW 6A free, open-source model for 3D groundwater flow, transport, and coupled simulations.9.3
- FREEWATA free, GIS-centered modeling environment spanning groundwater simulation, analysis and planning.8.7
- ModelMuseFree Windows GUI for preparing groundwater model inputs, not a simulator itself.8.4
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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